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|
/*= -*- c-basic-offset: 4; indent-tabs-mode: nil; -*-
*
* librsync -- library for network deltas
* $Id$
*
* Copyright (C) 1999, 2000, 2001 by Martin Pool <mbp@samba.org>
* Copyright (C) 1999 by Andrew Tridgell <tridge@samba.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
| Ummm, well, OK. The network's the
| network, the computer's the
| computer. Sorry for the confusion.
| -- Sun Microsystems
*/
/*
* Network-byte-order output to the tube.
*
* All the `suck' routines return a result code. The most common
* values are RS_DONE if they have enough data, or RS_BLOCKED if there
* is not enough input to proceed.
*
* All the netint operations are done in a fairly simpleminded way,
* since we don't want to rely on stdint types that may not be
* available on some platforms.
*/
/*
* TODO: If we don't have <stdint.h> (or perhaps even if we do),
* determine endianness and integer size by hand and use that to do
* our own conversion routines. We possibly need this anyhow to do
* 64-bit integers, since there seems to be no ntohs() analog.
*/
#include <config_rsync.h>
#include <assert.h>
#include <sys/types.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "rsync.h"
#include "job.h"
#include "netint.h"
#include "trace.h"
#include "stream.h"
#define RS_MAX_INT_BYTES 8
/**
* \brief Write a single byte to a stream output.
*/
rs_result
rs_squirt_byte(rs_job_t *job, unsigned char d)
{
rs_tube_write(job, &d, 1);
return RS_DONE;
}
/**
* \brief Write a variable-length integer to a stream.
*
* \param job Job of data.
*
* \param d Datum to write out.
*
* \param len Length of integer, in bytes.
*/
rs_result
rs_squirt_netint(rs_job_t *job, rs_long_t d, int len)
{
unsigned char buf[RS_MAX_INT_BYTES];
int i, j;
if (len <= 0 || len > RS_MAX_INT_BYTES) {
rs_error("Illegal integer length %d", len);
return RS_INTERNAL_ERROR;
}
/* Fill the output buffer with a bigendian representation of the
* number. */
for (i = 0, j = len-1; i < len; i++, j--) {
buf[j] = d; /* truncated */
d >>= 8;
}
rs_tube_write(job, buf, len);
return RS_DONE;
}
rs_result
rs_squirt_n4(rs_job_t *job, int val)
{
return rs_squirt_netint(job, val, 4);
}
rs_result
rs_suck_netint(rs_job_t *job, rs_long_t *v, int len)
{
unsigned char *buf;
int i;
rs_result result;
if (len <= 0 || len > RS_MAX_INT_BYTES) {
rs_error("Illegal integer length %d", len);
return RS_INTERNAL_ERROR;
}
if ((result = rs_scoop_read(job, len, (void **) &buf)) != RS_DONE)
return result;
*v = 0;
for (i = 0; i < len; i++) {
*v = *v<<8 | buf[i];
}
return RS_DONE;
}
rs_result
rs_suck_byte(rs_job_t *job, unsigned char *v)
{
void *inb;
rs_result result;
if ((result = rs_scoop_read(job, 1, &inb)) == RS_DONE)
*v = *((unsigned char *) inb);
return result;
}
rs_result
rs_suck_n4(rs_job_t *job, int *v)
{
rs_result result;
rs_long_t d;
result = rs_suck_netint(job, &d, 4);
*v = d;
return result;
}
int rs_int_len(rs_long_t val)
{
if (!(val & ~0xffL))
return 1;
else if (!(val & ~0xffffL))
return 2;
else if (!(val & ~0xffffffffL))
return 4;
else if (!(val & ~0xffffffffffffffffL))
return 8;
else {
rs_fatal("can't encode integer %.0f yet", (double) val);
}
}
|
